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Britain's Vodafone Group
The merger comes after India's mobile industry was thrown into turmoil with the launch last year of Reliance Jio Infocomm, the new 4G mobile broadband network built at a cost of more than $20 billion by India's richest businessman, Mukesh Ambani, as part of his Reliance Industries
Jio has made an impact with free voice calls and cut-price data services, forcing India's three biggest operators - Bharti Airtel
Idea will have the sole right to appoint the chairman, while Vodafone will appoint the chief financial officer, it said.
The appointment of a chief executive officer and a chief operating officer would require the approval of both companies, which would get the right to nominate three board members each.
Vodafone, the world's second-largest cellphone operator, has endured a tumultuous ride since it entered India in 2007, with fierce competition and a high-profile tax battle making a business contributing more than 10 percent of its revenues and profits its most unpredictable by far.